Homonuclear molecule

homonuclearhomonuclear diatomic moleculesTwo atoms of the same element
Homonuclear molecules, or homonuclear species, are molecules composed of only one type of element.wikipedia
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Molecule

molecularmoleculesmolecular structure
Homonuclear molecules, or homonuclear species, are molecules composed of only one type of element.
A molecule may be homonuclear, that is, it consists of atoms of one chemical element, as with oxygen (O 2 ); or it may be heteronuclear, a chemical compound composed of more than one element, as with water (H 2 O).

Halogen

halogensgroup 1717
Homonuclear diatomic molecules include hydrogen (H 2 ), oxygen (O 2 ), nitrogen (N 2 ) and all of the halogens.
The halogens form homonuclear diatomic molecules (not proven for astatine).

Diatomic molecule

diatomicdiatomic moleculesdi-
The most familiar homonuclear molecules are diatomic, meaning they consist of two atoms, though not all diatomic molecules are homonuclear. Sulfur forms several allotropes containing different numbers of sulfur atoms, including diatomic, triatomic, hexatomic and octatomic (S 2, S 3, S 6, S 8 ) forms, though the first three are rare.
If a diatomic molecule consists of two atoms of the same element, such as hydrogen (H 2 ) or oxygen (O 2 ), then it is said to be homonuclear.

Chemical element

elementelementschemical elements
Homonuclear molecules, or homonuclear species, are molecules composed of only one type of element.

Atom

atomsatomic structureatomic
The most familiar homonuclear molecules are diatomic, meaning they consist of two atoms, though not all diatomic molecules are homonuclear. Homonuclear molecules may consist of various numbers of atoms, depending on the element's properties.

Hydrogen

HH 2 hydrogen gas
Homonuclear diatomic molecules include hydrogen (H 2 ), oxygen (O 2 ), nitrogen (N 2 ) and all of the halogens.

Oxygen

OO 2 molecular oxygen
Homonuclear diatomic molecules include hydrogen (H 2 ), oxygen (O 2 ), nitrogen (N 2 ) and all of the halogens.

Nitrogen

NN 2 dinitrogen
Homonuclear diatomic molecules include hydrogen (H 2 ), oxygen (O 2 ), nitrogen (N 2 ) and all of the halogens.

Ozone

ozonationO 3 ozone generator
Ozone (O 3 ) is a common triatomic homonuclear molecule.

Arsenic

AsAs 2 Arsenate
Homonuclear tetratomic molecules include arsenic (As 4 ) and phosphorus (P 4 ).

Phosphorus

PP 4 phosphoric
Homonuclear tetratomic molecules include arsenic (As 4 ) and phosphorus (P 4 ).

Allotropy

allotropeallotropesallotropic
Allotropes are different chemical forms of the same element (not containing any other element).

Allotropes of oxygen

dioxygenmolecular oxygenatomic oxygen
In addition to the most common form of gaseous oxygen, O 2, and ozone, there are other allotropes of oxygen.

Sulfur

sulphurSbrimstone
Sulfur forms several allotropes containing different numbers of sulfur atoms, including diatomic, triatomic, hexatomic and octatomic (S 2, S 3, S 6, S 8 ) forms, though the first three are rare.

Allotropes of sulfur

allotrope of sulfurallotropesforms of molten elemental sulfur
Sulfur forms several allotropes containing different numbers of sulfur atoms, including diatomic, triatomic, hexatomic and octatomic (S 2, S 3, S 6, S 8 ) forms, though the first three are rare.

Octatomic element

octatomic
Sulfur forms several allotropes containing different numbers of sulfur atoms, including diatomic, triatomic, hexatomic and octatomic (S 2, S 3, S 6, S 8 ) forms, though the first three are rare.

Disulfur

S 2 diatomic sulfur
Sulfur forms several allotropes containing different numbers of sulfur atoms, including diatomic, triatomic, hexatomic and octatomic (S 2, S 3, S 6, S 8 ) forms, though the first three are rare.

Trisulfur

S 3 radical anionS3-
Sulfur forms several allotropes containing different numbers of sulfur atoms, including diatomic, triatomic, hexatomic and octatomic (S 2, S 3, S 6, S 8 ) forms, though the first three are rare.

Hexasulfur

S 6
Sulfur forms several allotropes containing different numbers of sulfur atoms, including diatomic, triatomic, hexatomic and octatomic (S 2, S 3, S 6, S 8 ) forms, though the first three are rare.

Octasulfur

S 8 cyclooctasulfurcyclic 8-chain sulfur
Sulfur forms several allotropes containing different numbers of sulfur atoms, including diatomic, triatomic, hexatomic and octatomic (S 2, S 3, S 6, S 8 ) forms, though the first three are rare.

Carbon

Ccarbonaceouscarbon atom
The element carbon is known to have a number of homonuclear molecules, including diamond and graphite.

Diamond

diamondsdiamond miningindustrial diamond
The element carbon is known to have a number of homonuclear molecules, including diamond and graphite.

Graphite

graphiticblack leadplumbago
The element carbon is known to have a number of homonuclear molecules, including diamond and graphite.

Excimer lamp

dissociative electron attachmentExcimer light sourcesexcimer ultraviolet lamps
Initially, only homonuclear diatomic molecules with a stable excited state but a repulsive ground state were called excimers (excited dimers).